// http://infoarena.ro/problema/next
#include <stdio.h>
#include <string.h>

FILE *fin = fopen("next.in","r"), *fout = fopen("next.out","w");
char N[1000005];
int REZ[1000005];
long long D, S;

// functia <mod> dupa debugging pare a fi buna :)
// sunt probleme la functia <suma>
long mod(char a[],long long b)
{
 long i;
 long long t = 0;
 for(i = 0 ; i <= S - 2 ; i++)
	{
	 t = (t * 10 + (a[i] - '0')) % b;
	}
 return t;
}

void suma(long long b)
{
 int i, t = 0;
 for (i = 0; b || t; i++, b /= 10, t /= 10)
	REZ[i] = (t += ((N[S - i - 2] - '0') + b % 10)) %  10;
 for (int j = i; j < S - 1; j++)
	if (j == i) REZ[j] = (N[S - j - 2] - '0') + t;
	else REZ[j] = (N[S - j - 2] - '0');
}

int main()
{
 long long r1, r2;
 fgets(N, 1000005, fin);  // citire din fisier numar mare
 S = strlen(N);
 fscanf(fin, "%lld\n", &D);
 r1 = mod(N, D);
 r2 = (D - r1) % D;
 suma(r2);
 for (long i = S - 2; i >= 0; i--)
	fprintf(fout, "%d", REZ[i]);
 fcloseall();
 return 0;
}